<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js - skinning - simple</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - simple skinning
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';

			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import { GLTFLoader } from './jsm/loaders/GLTFLoader.js';

			let stats, mixer, camera, scene, renderer, clock;

			init();
			animate();

			function init() {

				const container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 18, 6, 18 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xa0a0a0 );
				scene.fog = new THREE.Fog( 0xa0a0a0, 70, 100 );

				clock = new THREE.Clock();

				// ground

				const geometry = new THREE.PlaneGeometry( 500, 500 );
				const material = new THREE.MeshPhongMaterial( { color: 0x999999, depthWrite: false } );

				const ground = new THREE.Mesh( geometry, material );
				ground.position.set( 0, - 5, 0 );
				ground.rotation.x = - Math.PI / 2;
				ground.receiveShadow = true;
				scene.add( ground );

				const grid = new THREE.GridHelper( 500, 100, 0x000000, 0x000000 );
				grid.position.y = - 5;
				grid.material.opacity = 0.2;
				grid.material.transparent = true;
				scene.add( grid );

				// lights

				const hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444, 0.6 );
				hemiLight.position.set( 0, 200, 0 );
				scene.add( hemiLight );

				const dirLight = new THREE.DirectionalLight( 0xffffff, 0.8 );
				dirLight.position.set( 0, 20, 10 );
				dirLight.castShadow = true;
				dirLight.shadow.camera.top = 18;
				dirLight.shadow.camera.bottom = - 10;
				dirLight.shadow.camera.left = - 12;
				dirLight.shadow.camera.right = 12;
				scene.add( dirLight );

				//

				const loader = new GLTFLoader();
				loader.load( './models/gltf/SimpleSkinning.gltf', function ( gltf ) {

					scene.add( gltf.scene );

					gltf.scene.traverse( function ( child ) {

						if ( child.isSkinnedMesh ) child.castShadow = true;

					} );

					mixer = new THREE.AnimationMixer( gltf.scene );
					mixer.clipAction( gltf.animations[ 0 ] ).play();

				} );

				//

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.shadowMap.enabled = true;
				container.appendChild( renderer.domElement );

				//

				stats = new Stats();
				container.appendChild( stats.dom );

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.enablePan = false;
				controls.minDistance = 5;
				controls.maxDistance = 50;

			}

			function animate() {

				requestAnimationFrame( animate );

				if ( mixer ) mixer.update( clock.getDelta() );

				render();
				stats.update();

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>
